Abstract: A construction information management device and a construction information management system can readily grasp the history information about each layer below the surface of a road on which construction has been repeatedly carried out. After a subject construction is finished, a user creates the construction information about the subject construction in a construction information processing terminal, and the construction information is transmitted to a construction information management device. The construction information management device receives the construction information, and, based on the construction information, analyzes the pavement structure of the construction zone. Based on the analyzed construction information, the construction information management device also updates the history information about the construction subject road in a superimposing manner.

Abstract: A clutch disc consists of a generally annular drive body connectable to an engine side and rotatably movably connected to a generally annular driven body connected to a vehicle drive line. The drive body is formed with a plurality of radially inwardly extending drive side arms. The driven body is formed with a plurality of radially outwardly extending driven side arms. A fluid chamber to be filled with a hydraulic fluid is formed between each drive side arm and each driven side arm. An orifice is formed between the inner periphery of the drive body and the radially outer-most portion of each driven side arm to provide a flow resistance to the fluid flowing between the adjacent fluid chambers, thereby effectively damping torque fluctuation transmitted from the engine side.